It's a polar graph, imagine a clock hand sweeping out 5 years per hour. So at noon it's 1955, at 3 o'clock it's 1970, and so on. Meanwhile a pen on the clock hand represents life expectancy at birth, so it moves outward as the hand moves clockwise, making a spiral.
All of that said, it's a *really gratuitiously bad and pointless* polar graph.
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.